I have three different QRS versions of "Darktown Strutters' Ball",
all with the catalog number QRS 164!  (There may be many more
versions, considering how often QRS used original roll numbers for
later arrangements.)

The first is a "jass fox trot" played by Ted Baxter and Max
Kortlander, issued in February of 1917.  (This is the version in the
scan sent by Marshall Jose in MMD 150529).  It is not my preferred
arrangement because of the heavy marimba effects.

The remaining two versions are played by J. Lawrence Cook.  They
are undated, but the arrangements appear come from the 1940s or 1950s.
The one I prefer has a box label (but not the roll) marked "featuring
a One-Step Chorus".  The roll does indeed shift into a double-time
one-step chorus at the end.

This hot version was brought to our attention by the late Mike
Montgomery, probably in one of his roll auctions.  I purchased my copy
from him in 1991.

Gary Watkins